What's going on with Iran?

First we are sending a high level diplomat to the nuke talks in Geneva for direct negotiations, now the BBC is reporting that the US is refusing to deny reports that we will be opening a mission of some kind in Tehran:

The US has refused to deny reports that it will establish a US diplomatic presence in Iran in the next month.

The UK's Guardian newspaper reports the US plans to open an interests section in Tehran, its first diplomatic presence in the country for 30 years.

...

US officials said recently that the idea of a diplomatic presence in Iran was being discussed, but that it was not being actively worked on.

The unsourced Guardian report said that the interests section - a step towards setting up an embassy - would be similar to the one in Cuba.

All I can figure is that the Council of Guardians or whatever they call them have made some sort of behind the scenes overture.